Three microcode cycles for the writeback alone. That's acceptable because segment loads are already expensive multi-cycle operations, and the designers likely expected them to be infrequent -- most programs load their segments once at startup and never touch them again. Page translations happen on every memory access, so the same approach would be ruinous. Hence the fully autonomous hardware walker.
The first ERMA system went into use in 1959. While IBM was the leader in unit
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Mr Lemmens explained that the "re-entry of human-made objects into Earth's atmosphere occurs quite frequently". He said it happens weekly for bigger spacecraft and daily for smaller ones.
第二十九条 国家支持核反应堆在动力、供热、海水淡化、制氢、同位素生产以及科研等方面的应用。
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